Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6321862 | Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability | Christopher C. Beuershausen, Robert J. Costo, Jr., Danny E. Scott, Rudolf Carl Pessier, Roland Illerhaus +3 more | 2001-11-27 |
| 6112836 | Rotary drill bits employing tandem gage pad arrangement | James A. Norris, Christopher C. Beuershausen, Rudolf Carl Pessier, Michael P. Ohanian, Roland Illerhaus +2 more | 2000-09-05 |
| 6006845 | Rotary drill bits for directional drilling employing tandem gage pad arrangement with reaming capability | Roland Illerhaus, Christopher C. Beuershausen, Mark W. Dykstra, James A. Norris, Michael P. Ohanian +1 more | 1999-12-28 |